Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory. This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using non-photosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont, a cell living within another cell. Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts.
—from Campbell Biology AP Edition, a book by Campbell
Active since October 7, 2017.
676 total characters in this text.
View Pit Stop page for this text
Rank | Username | WPM | Accuracy | Date |
---|---|---|---|---|
1540. | David (dazzlethc) | 70.50 | 97% | 2020-03-07 |
1541. | Dmeister (dclott) | 70.50 | 97% | 2019-11-23 |
1542. | sweetyukibo (sweetyukibo) | 70.47 | 97% | 2018-02-02 |
1543. | Beddytear (beddytear) | 70.46 | 96% | 2020-11-19 |
1544. | Ray (ray_maddox) | 70.45 | 95% | 2020-05-19 |
1545. | LEntless (lentless) | 70.42 | 97% | 2017-10-07 |
1546. | Troels (duckzern) | 70.42 | 96% | 2019-09-09 |
1547. | teetoHappy (teetohappy) | 70.37 | 95% | 2020-12-18 |
1548. | The (pseudotypist) | 70.35 | 96% | 2020-11-11 |
1549. | Jennifer (jenniferzed) | 70.32 | 95% | 2017-10-10 |
1550. | slagtherisen (slagtherisen) | 70.27 | 98% | 2018-03-23 |
1551. | Jordy (mrollie) | 70.23 | 96% | 2018-02-19 |
1552. | Mattias (illmajol) | 70.19 | 97% | 2019-03-12 |
1553. | Madelaine (madtherad) | 70.15 | 97% | 2018-07-22 |
1554. | Tomaz (tomaz1502) | 70.15 | 95% | 2019-11-14 |
1555. | Valk (blankfox) | 70.15 | 97% | 2019-09-03 |
1556. | Sora (soralimit) | 70.10 | 96% | 2018-03-25 |
1557. | Cal (almostpoetic) | 70.10 | 97% | 2019-01-06 |
1558. | XrXr (xrxr) | 70.09 | 95% | 2018-08-02 |
1559. | Matthew (tycru) | 69.99 | 95% | 2018-12-05 |
1560. | God is love ᗜ (kjb3plover) | 69.97 | 89% | 2019-06-28 |
1561. | Jeffrey (jeffrey7212) | 69.96 | 95% | 2019-05-08 |
1562. | Marcus (asdfmango) | 69.96 | 95% | 2018-05-05 |
1563. | Chitraketu (alpha1321) | 69.96 | 97% | 2020-03-20 |
1564. | Zach (encasedthought) | 69.95 | 96% | 2017-10-09 |
1565. | JJ (jjbonta) | 69.94 | 96% | 2017-11-29 |
1566. | Gabriel (gblue1102) | 69.94 | 97% | 2017-10-27 |
1567. | Dylan (dzeddy) | 69.90 | 96% | 2019-04-25 |
1568. | Sammy (sammyaxel) | 69.86 | 96% | 2020-07-16 |
1569. | krabbos (krabbos) | 69.81 | 97% | 2018-06-26 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
New English Texts | 1 | 108.31 | May 26, 2022 |